A Bipolar Current-Pulsed Power Supply With Dual-Pulse Energy Boosting for Shallow Electromagnetic Detection

Liu, Wei; Hu, Xuquan; Liao, Xian; Liu, Longhuan; Fu, Zhihong

doi:10.1109/tpel.2021.3113371

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…However, low charging efficiency makes it difficult to increase the peak value and edge steepness [26]. The multi-pulse charging process also causes considerable noise during the data measurement process [29,30]. and position mapping.…”

Section: Bcpps and New Charging Strategymentioning

confidence: 99%

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Liao,

Xu,

Liu

et al. 2023

Sensors

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This paper proposes a nondestructive, separate transmitter-receiver (TX-RX) electromagnetic measurement system for near-surface detection. Different from the traditional dual-coil integrated design, the proposed transient electromagnetic (TEM) system performs shallow subsurface detection using independent TX coil and movable RX coils. This configuration requires a large primary field so that the far-away secondary field is able to generate reliably induced voltages. To achieve this goal, a bipolar current-pulsed power supply (BCPPS) with a late resonant charging strategy is designed to produce a sufficiently large magnetic moment for the exciting coil with low source interference. The magnetic dipole source (MDS) with a large proportion of weight is separated from the field observation device and does not need to be dragged or transported during the detection process. This setup lowers the weight of the scanning device to 3 kg and greatly improves the measurement efficiency. The results of the laboratory test verify the effectiveness of the separate MDS and RX module system. Field experimental detection further demonstrates that the proposed system can realize highly efficient and shallow surface detection within a 200 m range of the MDS device.

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Section: Bcpps and New Charging Strategymentioning

confidence: 99%

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Liao,

Xu,

Liu

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

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“…Therefore, it is crucial to determine the optimal value of the damping resistance for T analyzing the TC. Typically, this calculation is performed based on a second-order circuit model comprised of the transmitting coil's inductance and parasitic capacitance under critical damping conditions [16][17][18][19]. However, this method disregards the impact of the switching device's parasitic capacitance on the critical damping resistance value.…”

Section: Introductionmentioning

confidence: 99%

Influence of Parasitic Capacitance on Turn-Off Current and Its Optimization Method for Transient Electromagnetic System

Liao,

Xu,

Liu

et al. 2024

IEEE Trans. Instrum. Meas.

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In transient electromagnetic (TEM) inverter circuits, a damping resistor is typically connected in parallel to the transmitting coil to prevent overshoot during the turn-off period of the pulse current. This configuration results in an exponential decay waveform for the pulse current, which prolongs the turn-off time and increases the nonlinear error. This paper analyzes the impact of the parasitic capacitance on the value of the damping resistor and the end-period waveform of the pulse current base on the inverter circuits, and proposes an optimized control method to reduce both the turn-off time and the nonlinear error of the pulse current. The method is validated through the construction of an experimental circuit. According to the experimental data, this optimization method reduces the turn-off time by 23.8% and the nonlinear error by 5.5%. In the unexploded ordnance (UXO) detection experiment, the optimization method's detection results exhibit higher resolution.

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Current oscillation elimination for the helicopter transient electromagnetic inverter based on pole configuration

Zhang

Wang

et al. 2023

Review of Scientific Instruments

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In a helicopter transient electromagnetic system, the quality of the transmitting-current waveform will affect the geological exploration effect. In this paper, a helicopter TEM inverter, based on a single-clamp source and pulse width modulation technology, is designed and analyzed. Besides, it finds that there will be current oscillation in the early measuring stage. For this problem, first, the factors that cause the current oscillation are analyzed. Then, it is proposed to apply the RC snubber to eliminate this current oscillation. Since the imaginary part of the pole is the essence of oscillation, configuring the pole can eliminate the current oscillation. By establishing the early measuring stage system model, the characteristic equation of the load current with the snubber circuit is deduced. Next, the characteristic equation is solved by the exhaustive method and the root locus method to obtain the parametric region that eliminates the oscillation. Finally, through simulation and experimental verification, the proposed snubber circuit design method can be used to eliminate the early measuring stage current oscillation. Compared to the method of switching into the damping circuit, it can achieve the same performance, more important is that there is no switching action and it is easy to achieve.

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A Bipolar Current-Pulsed Power Supply With Dual-Pulse Energy Boosting for Shallow Electromagnetic Detection

Cited by 7 publications

References 28 publications

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Electromagnetic Detection System with Magnetic Dipole Source for Near-Surface Detection

Influence of Parasitic Capacitance on Turn-Off Current and Its Optimization Method for Transient Electromagnetic System

Current oscillation elimination for the helicopter transient electromagnetic inverter based on pole configuration

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